Die for forming container lids



July 20, 1965 P. H. CARTER DIE FOR FORMING CONTAINER LIDS Original Filed Oct. 21, 1960 2 Sheets-Sheet 1 u 4*? M v. a u mm E x Z o w h I 14. AI m G L 3 l U a 4 I F m H4 4 h m 2 4 7 w w u u 2 T w M \\\\\\\\\\\\q\\ .4. LV/ 3 H n t H w 2 A m mx i u u Hm I f IIQ 1 w w M... .Y6

ATTORNEY y 1965 P. H. CARTER 3,195,423

' DIE FR FORMING CONTAINER LIDS Original Filed Oct. 21, 1960 2 Sheets-Sheet 2 no.3. 32 FIG 4.

INVENTOR PAUL h. /M'TIE ATTORNEY United States Patent 3,195,423 DIE FOR FORMING CONTAINER LIDS Paul H. Carter, Baltimore, Md., assignor to Maryland Cup Corp., Owings Mills, MIL, a corporation of Maryland Original application Oct. 21, 1960, Ser. No. 63,998. Divided and this application Sept. 23, 1963, Ser. No.

1 Claim. (Cl. 93-13) This is a division of my copending application Serial No. 63,998, filed October 21, 1960, now abandoned.

This invention relates to conical containers, including frusto-conical containers of the type customarily used for ice cream cone confectionary products and it is more particularly concerned with the end covers or lids for such containers.

The general object of the invention is the provision of a die for forming such lids having flanges to fit the slanting walls of the containers.

Another object of the invention is the provision of a die by means of which the end members can be cut from a blank and provided with a pleatless flange in a simple die operation.

A further object of the invention is the provision of such a die which is simple, rugged, reliable and easy to operate and maintain for prolonged periods of time.

These and other objects, features and advantages of the invention will be more fully understood from the following description considered together with the accompanying drawing.

In the drawing:

FIG. 1 is a longitudinal cross-sectional view of a threepart die for forming the flanged paper disc member from a circular blank deposited in the lower part.

FIG. 2 is a similar view of the same three-part die Wheren the parts are disposed in their relative positions for cutting from the blank the portion thereof to form the end wall flanged disc.

FIGS. 3, 4 and 5 are similar, but fragmantary, views of the same three die parts in successive positions to complete the operation.

FIG. 6 is a cross-sectional view along the line 66 of FIG. 1 with the blank removed.

FIG. 7 is a cross-sectional view along the line 7-7 of FIG. 2.

FIG. 8 is a top plan view of the formed end wall member resulting from the action of the three-part die.

Referring with more particularity to the drawing, in which like numerals designate like parts, the three-part die comprises an outer hollow cylindrical member 31, an intermediate sleeve 32 in the general shape of a hollow cylinder, and a cylindrical plunger 33 the diameter of which is equal to the diameter of the web portion of the flanged disc to be formed.

The sleeve 32 is adapted to be moved axially in and out of the outer member 31 and the plunger 33 is slidably disposed for axial reciprocation in the sleeve 32.

The bottom of the outer cylinder 31 has a primary restricted portion 34 forming at the top an upwardly facing shoulder 35. The annular edge 36 between the shoulder and the adjacent inner Wall portion 37 is sharp to provide a cutting edge. A secondary restricted portion 38 projects inwardly from the wall 37 in a plane below the edge 36 to provide an upwardly facing shoulder 39. The annular edge 40 between the shoulder 39 and the inner wall 41 of the portion 38 is quarter-rounded as shown.

The lowermost portion 42 is enlarged relative to the restricted portion 38 and serves as a discharge chamber fior the flanged disc resulting from the operation of the 3,195,423 Patented July 20, 1965 The lower end 43 of the sleeve 32 is recessed to fit closely in the inner wall portion 37 and is of suflicient length to form an annular pocket 44 with the adjacent wall of the outer member 31 for the reception of rings 45 that are removed by the cutting action of the die on the blanks 46 from which the flanged discs are made.

In operation, the die is first opened, as shown in FIG. 1, by separating the outer cylinder 31 from the sleeve 32 and plunger 33. The blank 46, made of a flexible sheet of paper, preferably slightly waxed, and of a diameter substantially equal to the inner diameter of the cylinder 31, is placed in the cylinder 31 whereupon it is permitted to come to rest on the shoulder (see FIG. 1). The sleeve 32 is then inserted in the cylinder 31 (see FIG. 2) and telescoped therewith until the lower end of the sleeve 32 enters the portion 37, whereupon the blank is sheared at the edge 36, leaving a ring in the pocket 44. The resulting inner disc 47 comes to rest on the shoulder 39 and pressure is applied to a continuous rim edge thereof in contact with the bottom edge 48 of the lower end 43 of the sleeve 33. With the blank in this position, the plunger 33 is then moved downwardly against the disc 47 with suflicient force to overcome the pressure on its rim. The outer diameter of the plunger 33 and the inner diameter of the sleeve 32 are somewhat smaller than the diameter of the secondary restricted portion 41, to an amount just suflicient to contain a flanged rim portion 49 in the annular space 50' between the plunger and the portion 41 (see FIG. 4). Accordingly, when the plunger moves downwardly through this restricted portion 41, removing the disc from the shoulder 39, the flange 49 is formed and, at the same time, is ironed smooth of pleats as the flange is rubbed against the rounded edge 40 and the walls of the portion 41.

When the resulting flanged disc 47 reaches the enlarged portion 42, pressure is released thereupon and it drops away from the bottom of the plunger (see FIG. 5). The fibrous structure of the paper is such as to give it a degree of resilience which results in the flanged part 49 assuming in its pressure-free state a frusto-conical shape (see FIG. 5

Having thus described my invention, I claim:

A die for forming a paper disc with a pleatless frustoconical flange from a circular blank sheet of paper, said die comprising:

(a) a hollow outer cylindrical member for receiving the blank and supporting it laterally in a horizontal position;

(b) a shelf member at the bottom of the interior of the cylindrical member for supporting the blank in a horizontal position with the periphery of the circular blank in contact with the inner wall of the hollow cylindrical member, said shelf member having a central vertical opening of a diameter equal to the overall diameter of the paper disc plus a radial extension therefrom from which the flange is to be formed;

(c) an inner hollow cylindrical member co-axially disposed in said outer hollow cylindrical member, having its lower end recessed to form a bottom edge adapted to co-act with said central opening to shear a circular section from said blank, said lower recessed end comprising with the outer cylinder, a chamber for receiving and holding circular waste portions of blanks resulting from said shearing operations;

(d) said shelf member having an inwardly extending annular shoulder below its upper edge for receiving a sheared circular section cut from a blank and supporting in a horizontal position along the area of the said extension, said annular shoulder lying adjacent a vertical central opening of a diameter sub- 3 V 7 7 4 stantially equal to the diameter of the said inner References Cited by the Examiner cylindrical member, the inner annular edge of said UNITED STATES PATENTS annular shoulder being beveled; and

(e) a plunger reciprocably disposed in said inner cylindrical member for applying pressure downwardly 5 1,534,698 4/25 Gansert at 3 against the circular section of the blank when the 2,832,522 7 7 Schlanger i-"V 55 X said marginal edge is pressed between the bottom of g a I Y a the inner cylindrical member and the said shoulder FRANKE"BAILEY Pr'mary m to form the pleatless flange. BERNARD STIC KNEY, Examiner.

353,439 11/86 Butters. 

